KR101525893B1

KR101525893B1 - collapsible ladder

Info

Publication number: KR101525893B1
Application number: KR1020140021745A
Authority: KR
Inventors: 박률
Original assignee: (주) 우석디앤씨
Priority date: 2014-02-25
Filing date: 2014-02-25
Publication date: 2015-06-03

Abstract

The present invention relates to a foldable ladder enabling a user to safely perform works by preventing legs from being folded when the ladder is in use, enabling high place works by preventing the legs from being unfolded without an external force when the ladder is folded and including a slip preventing means on each of a step board and legs to prevent the user from sliding and falling from the step board or to prevent the ladder from sliding on the ground.

Description

Collapsible ladder

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a folding type ladder, and more particularly, to a folding type ladder which prevents a leg from being folded with each other in use, It is about a concession ladder.

In addition, the present invention relates to a folding type ladder which is provided with a slip prevention means on each of a tread and a leg so that an operator can slip down from the tread, or the ladder itself can be prevented from slipping on the ground,

Ladders have been used as a means of complaint handling.

Typically, such a ladder is constructed by installing a plurality of crossbars at regular intervals between two frames. After leaning on a wall or a structure, an operator raises the crossbars to perform a high altitude operation.

As described above, the conventional ladder has a problem that the worker rises with the upper end thereof leaning against the wall or the structure after fixing the lower end to the ground, and the lower end of the ladder slips and falls in this process frequently .

Further, when there is no structure or wall to be supported, there is no part to lean the ladder, so there is a problem that the use is limited.

In order to overcome such disadvantages, a ladder which can be used stand-up independently has been developed and used, for example, Patent Documents 1 and 2.

Patent Document 1 discloses a fixing device for a folding type ladder in which a fixing member is attached to each of upper ends of two struts, a portion extending from the fixing member is rotatably connected, and then a fixing mechanism is coupled to the fixing member with a fixing pin, In order to prevent detachment of the fixing mechanism from the fixing pin, a locking protrusion is formed on the insertion hole of the fixing mechanism into which the fixing pin is inserted to improve the coupling force, and a spring is coupled to the fixing pin,

Patent Document 2 discloses an image display device comprising: an outer and an inner frame extending parallel to each other and having first and second foot plates divided in a middle portion and horizontally attached in parallel at regular intervals; A first ladder and a second ladder having a foldable link structure of a double frame inward / outward by a link bar connecting the outer frame and the inner frame to a hinge pin; An inner lower bracket connecting the upper end of the inner frame to the hinge pin; To a foldable stepped safety ladder comprising an upper bracket connecting upper ends of the outer frame with hinge pins on both sides and guiding means for allowing the lift pins in the middle of the lower bracket to operate up and down.

Such a conventional ladder allows the two ladders to be independent from each other when the upper ends of the two ladders are hingedly coupled to each other so that the two ladders are angled with respect to each other and supported by each other.

However, even in the case of these ladders, since the angle between the two ladders is not fixed, when the bottom of the two ladders slips and the angle between the two ladders is opened during use, the worker who is working above falls, There is a problem that the worker is injured.

Also, when folded, it was not fixed and it was difficult to carry by unfolding itself.

Korean Utility Model Registration No. 0272752 Korea Patent No. 1174553

SUMMARY OF THE INVENTION The present invention has been developed in order to solve the above-mentioned problems, and it is an object of the present invention to provide an apparatus and a method for preventing the legs from being folded with each other in use, And to provide a folding type ladder which is capable of preventing a collision.

In addition, the present invention provides a folding type ladder having a tread plate and legs respectively provided with anti-slip means to prevent a worker from slipping down from the tread plate or sliding the ladder itself on the ground, The purpose.

According to an aspect of the present invention, there is provided a folding type ladder comprising: (A) a guide elongated hole formed through both side walls, a fixing groove formed at a lower center of a side wall thereof, A tread that acts as a scaffold; (B) a bracket provided at both ends of the tread plate and provided with the following legs; (C) a turning leg hinged to each of the tread plates by hinge pins provided through sidewalls of the tread plate, one end of which is hinged to the brackets; (D) a folding leg fixed to both ends of a pivot pin provided through the guide elongated hole, one end of which is fixed to the opposite side of the pivot leg of the bracket; (E) a spring rotatably connected at both ends to the hinge pin and the pivot pin to elastically support the hinge pin and the pivot pin; And (F) a fixing bar fitted in the fixing groove when the leg is folded to fix the legs so as not to be unfolded.

It is preferable that a non-slip pad is further provided on the upper surface of the tread plate to prevent the slippery operator from climbing on the tread.

As described above, the folding type ladder according to the present invention is configured such that one leg is rotatably connected to the side wall of the tread plate, and the other leg is provided so as to be rotatable along a guide elongated hole formed in a side wall of the tread plate, There is an effect that the ladder can be prevented from falling down by preventing the leg from being opened unintentionally.

Further, in the present invention, a spring is provided between the hinge pin and the pivot pin for connecting the two legs to the tread plate and the bracket, and when the leg is unfolded, it is supported so as not to be folded inward. The two legs are not unfolded by being fixed, so that it is possible to facilitate carrying and storing.

Further, the anti-slip pad is provided on the upper surface of the tread plate to prevent the operator's foot from slipping from the tread.

1 is a perspective view of a folding type ladder according to the present invention,
2 is a bottom perspective view of a folding type ladder according to the present invention.
Fig. 3 is a side view of the folding type ladder according to the present invention
Figure 4 is a side view of the folded ladder according to the present invention;

Hereinafter, a folding type ladder according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

The present invention can prevent the legs from being folded to each other in a use state, and can stably work. When folded, it is possible to prevent unfolding without external force. (A) A tread 10h through which the guide hole 10h is formed, a fixing groove 10g formed at the lower center of the side wall, and a tread 10 serving as a stepping-foot for the operator to stand on in an unfolded state; (B) a bracket (20) provided at both ends of the tread plate and provided with the following legs; (C) a pivotal leg (30) hingedly fixed to the tread plate by a hinge pin (31) provided through a side wall of the tread plate, one end of which is hinged to the bracket; (D) a folding leg (40) fixed to both ends of a pivot pin (41) installed through the guide elongated hole (10h), one end fixed to the opposite side of the pivot leg of the bracket; (E) a spring (50) rotatably connected at both ends to the hinge pin (31) and the pivot pin (41) to elastically support the hinge pin (31) and the pivot pin (41); And (F) a fixing bar (33) for fixing the legs (30, 40) by unfolding the legs (30, 40) when the legs (30, 40) are folded.

As shown in FIGS. 1 and 2, the tread plate 10 has reinforcing ribs 10r formed longitudinally and laterally on the bottom surface of the plate body, and both side walls extend to provide a wide area for mounting the brackets 20 .

As shown in FIG. 2, both side walls of the tread plate 10 are formed as double walls. The bracket 20 provided on the wall is supported more firmly, and a plurality of hinge pins 31 penetrating therethrough The pin 41 is supported more firmly. Of course, it is preferable that a reinforcing vane is formed between the double sidewalls so that the two double walls are connected to each other to reinforce the strength.

It is preferable that the tread plate 10 is made by injection molding with a synthetic resin or the like.

As described above, the tread plate 10 is provided with a non-slip pad 10p to prevent an operator from slipping when the worker's foot slips when the worker's foot slips.

The non-slip pad 10p may be made of rubber or synthetic resin having stretchability, and may have irregularities on its surface.

As the means for supporting the tread 10, the pivoting leg 30 and the folding leg 40 are provided, and both of the pivoting legs 30 are provided on both sides of the treading plate. The bracket 20 is provided as means for connecting the legs 30, 40 to the tread 10 in a foldable state.

2, the bracket 20 is rotatably connected to one end corner portion of the bracket 20, and the folding leg 40 is fixed to the other end corner portion by a fixing means such as a fixing pin Is fixed.

The bracket 20 is formed by injection molding with a synthetic resin or the like. The end where the external leg 30 is provided is cut so that the pivotal leg can be pivoted. The end where the folding leg 40 is fixed is folded Holes having the same shape as the outer surface of the leg are formed, and the folded legs are fitted and engaged. Of course, fixing screws or rivets are provided on the outer wall of the portion where the folding leg is fitted so that the folding leg is not separated from the bracket.

The intermediate portion of the pivotal leg 30 is hingedly fixed to the tread 10.

That is, the pivotal leg 30 can be coupled to the side wall of the tread 10 by the hinge pin 31, and these pivotal legs are respectively installed at both ends of the tread, and the two pivotal legs 30 As shown in the figure, the hinge pin 31, which is a means for pivotally connecting the tread plate 10, uses a long one so that the end passes through the side wall of the tread plate and can be fixed to the two pivoting legs. Accordingly, the two pivotal legs 30 can be coupled to the tread 10 by only one hinge pin 31.

One end of the pivotal leg 30 is hinged to the bracket 20 so as to be rotatable.

The folding leg 40 fixed to the opposite side of the pivoting leg 30 is fixed to the bracket 20 as described above. When the pivoting of the bracket 20, It is regulated.

The folding legs 40 are also provided at both ends of the tread 10 like a turning leg.

As described above, the folding leg 40 is rotated by the rotation of the bracket 20 so that the angle between the turning leg and the folding leg becomes wide as shown in Figs. 1 to 3, , The folding leg is rotated according to the rotation of the bracket, and a guide elongated hole (10h) is formed on the side wall of the tread (10) to restrict the angle at which the folding leg is rotated Is formed.

That is, a pivot pin 41 is provided between the two folding legs 40, and the pivot pin 41 penetrates through the guide elongated hole 10h. When the pivot pin 41 is moved along the guide elongated hole 10h, the folding leg 40 is pivoted so that the pivot bracket 20 also rotates. At this time, the pivot bracket 20 hinged to one end of the bracket 20 30 are also rotated around the hinge pin 31 as shown in Fig.

The movement path and the movement range of the pivot pin 41 that is rotated along the guide elongated hole 10h are limited to the portion where the guide elongated hole 10h is formed and accordingly the pivot angle of the pivot 40 and the pivot 30 It is also limited to prevent the two legs from spreading too wide.

As shown in Figs. 1 to 3, the spring 50 is provided as a means for preventing the two legs 30 and 40 from being folded in the unfolded state.

2, the spring 50 is a torsion spring having one end connected to the hinge pin 31 and the other end connected to the pivot pin 41. In this state, The pin 31 and the pivot pin 41 are pushed away from each other so that the pivot 30 and the pivot 40 are not gathered.

When the ladder according to the present invention is folded, as described above, when the folding leg 40 is pushed toward the pivoting leg 30, the pivoting pin 41 moves along the guide elongated hole 10h, The bracket 20 also rotates so that the turning leg 30 hinged to one side of the bracket 20 is rotated by the hinge pin 31 fixed to the bracket.

When the pivotal leg 30 and the pivotal leg 40 are sufficiently pivoted, the treads 10 and 10 as well as the two legs 30 and 40 are in parallel with each other as shown in Fig. 4, And the fixed bar 33 installed is fixed in the fixing groove 10g formed at the lower end of the side wall of the tread 10.

The ladder according to the present invention constructed as described above is provided with a ring 11 on one side of the tread 10 so as to facilitate transportation or to hang a work tool.

In addition, one or more reinforcing bars 32 and 42 may be provided between each of the legs, that is, between the two pivoting legs 30 and between the two pivoting legs 40, (40), as well as to allow the foot to be raised when the tread is high. That is, the reinforcing bars 32 and 42 can also serve as a stepping stair when the ladder is high.

In addition, the non-skid cap 30p is installed at the lower ends of the legs 30 and 40 to prevent the legs from slipping on the ground, as well as to protect the legs and the floor.

That is, the legs 30 and 40 are preferably made of a metal pipe or the like so as to firmly support the tread 10, and when the ladder having such a leg is used indoors, The non-slip prevention cap 30p is installed to prevent slippage and to protect the floor.

1 to 4 show only the legs 30 and 40 having a short length. However, the legs may be elongated to perform a high-altitude work.

10: Step
10g: Fixing groove 10h: Guide fitting hole
10p: non-slip pad 10r: reinforcing rib
11: Ring
20: Bracket
30: pivotal leg 30p: non-slip cap
31: hinge pin 32:
33: Fixed bar
40: folding leg 40p: non-slip cap
41: Pivot pin
50: spring

Claims

A tread 10 having a guide elongated hole formed through both side walls, a fixing groove formed at a lower center of the side wall, and a stepping plate for an operator to stand on the tread;
A bracket 20 installed at both ends of the tread plate and having a turning leg 30 and a folding leg 40;
A turning leg (30) hinged to the tread plate by a hinge pin provided through a side wall of the tread plate and having one end fixed to the bracket by a hinge;
A folding leg (40) fixed at both ends of a pivot pin (40) inserted through the guide elongated hole and having one end fixed to the opposite side of the pivoting leg of the bracket;
A spring (50) rotatably connected at both ends to the hinge pin and the rotation pin to elastically support the hinge pin and the rotation pin;
And a fixing bar (33) for fixing the legs to be unfolded by being inserted into the fixing groove when the folding leg and the folding leg are folded.

The method according to claim 1,
And a non-slip pad is further provided on the upper surface of the tread.